ICD-10-PCS Code For Ear Nose Mouth And Throat: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group C91Y includes procedures performed to image functional processes in the ear, nose, mouth, and throat. These ICD-10-PCS codes are used for inpatient documentation when single-plane nuclear medicine imaging is performed after introduction of radioactive materials for diagnostic evaluation of the ear, nose, mouth, and throat. Accurate coding within the ICD-10-PCS C91Y group is essential for proper inpatient reimbursement, as it captures the specific imaging procedure performed and supports clinical documentation accuracy.

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Ear Nose Mouth And Throat Planar Nuclear Medicine Imaging Procedure Overview

Procedures in this group involve the introduction of radioactive materials to produce single-plane images of the ear, nose, mouth, and throat region by capturing emitted radiation. These nuclear medicine studies target the Ear, Nose, Mouth and Throat body system to visualize functional and physiological processes rather than anatomy alone. Accurate ICD-10-PCS coding of these procedures is important for inpatient records and reimbursement because it documents the specific imaging modality and body region evaluated. Proper coding supports correct case mix assignment and payment determination.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
9	Body System	Ear, Nose, Mouth and Throat
1	Operation	Planar Nuclear Medicine Imaging
Y	Body Part	Ear, Nose, Mouth and Throat

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ICD-10-PCS Code For Ear Nose Mouth And Throat: Procedure Code Group Overview

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Ear Nose Mouth And Throat Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
C	Section	Nuclear Medicine
9	Body System	Ear, Nose, Mouth and Throat
1	Operation	Planar Nuclear Medicine Imaging
Y	Body Part	Ear, Nose, Mouth and Throat

When to Use

Use a code from this group when radioactive tracers are introduced for a planar nuclear medicine study targeting the ear, nose, mouth, or throat to assess function or pathology. Do not use these codes for non-nuclear imaging modalities or for studies of other body systems.

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
C91YYZZ	Planar Nuclear Medicine Imaging of Ear, Nose, Mouth and Throat using Other Radionuclide

Typical Clinical Scenarios

An elderly patient is admitted with sudden onset unilateral facial pain, persistent otorrhea, and concern for an acute infection of the middle ear with suspected functional impairment of Eustachian tube drainage. Inpatient nuclear medicine planar imaging is ordered after administration of a radionuclide tracer to evaluate mucociliary clearance and functional activity of the ear structures when anatomical imaging is inconclusive. Typical codes: C91YYZZ
A pediatric patient with chronic recurrent sinusitis refractory to medical therapy is scheduled for an inpatient diagnostic workup to assess nasal mucosal function and sinus drainage prior to consideration of surgical intervention. A planar nuclear medicine study using a radionuclide is performed to visualize functional ventilation and clearance in the nasal and nasopharyngeal regions to guide management. Typical codes: C91YYZZ
A middle-aged patient is admitted with progressive dysphagia and suspected salivary gland dysfunction after prior head and neck irradiation; clinicians request a functional assessment to distinguish obstructive versus secretory causes. Planar nuclear medicine imaging of the mouth and throat region is performed following radionuclide introduction to evaluate salivary gland uptake and excretory function during the inpatient stay. Typical codes: C91YYZZ

Related Codes

C91B-SALIVARY-GLANDS-PLANAR-IMAGING

ICD-10-PCS Code For Salivary Glands, Bilateral: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
C91YYZZ	Planar Nuclear Medicine Imaging of Ear, Nose, Mouth and Throat using Other Radionuclide

Typical Clinical Scenarios

An elderly patient is admitted with sudden onset unilateral facial pain, persistent otorrhea, and concern for an acute infection of the middle ear with suspected functional impairment of Eustachian tube drainage. Inpatient nuclear medicine planar imaging is ordered after administration of a radionuclide tracer to evaluate mucociliary clearance and functional activity of the ear structures when anatomical imaging is inconclusive. Typical codes: C91YYZZ
A pediatric patient with chronic recurrent sinusitis refractory to medical therapy is scheduled for an inpatient diagnostic workup to assess nasal mucosal function and sinus drainage prior to consideration of surgical intervention. A planar nuclear medicine study using a radionuclide is performed to visualize functional ventilation and clearance in the nasal and nasopharyngeal regions to guide management. Typical codes: C91YYZZ
A middle-aged patient is admitted with progressive dysphagia and suspected salivary gland dysfunction after prior head and neck irradiation; clinicians request a functional assessment to distinguish obstructive versus secretory causes. Planar nuclear medicine imaging of the mouth and throat region is performed following radionuclide introduction to evaluate salivary gland uptake and excretory function during the inpatient stay. Typical codes: C91YYZZ

Related Codes

C91B-SALIVARY-GLANDS-PLANAR-IMAGING

ICD-10-PCS Code For Salivary Glands, Bilateral: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-PCS Code For Ear Nose Mouth And Throat: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Ear Nose Mouth And Throat: Procedure Code Group Overview policy alerts

Ear Nose Mouth And Throat Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

ICD-10-PCS Code For Ear Nose Mouth And Throat: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Ear Nose Mouth And Throat: Procedure Code Group Overview policy alerts

Ear Nose Mouth And Throat Planar Nuclear Medicine Imaging Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS code group covers planar nuclear medicine imaging of the ear, nose, mouth, and throat?

What is the primary purpose of procedures in the C91Y group?

In which ICD-10-PCS section and body system are these codes classified?

When should `C91YYZZ` be used for inpatient documentation?

Why is accurate coding within the C91Y group important for inpatient reimbursement?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS code group covers planar nuclear medicine imaging of the ear, nose, mouth, and throat?

What is the primary purpose of procedures in the C91Y group?

In which ICD-10-PCS section and body system are these codes classified?

When should `C91YYZZ` be used for inpatient documentation?

Why is accurate coding within the C91Y group important for inpatient reimbursement?

References